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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe2a8b10a1eed0ccb393118701625d7fa3900d304975afdd3e53812d92efc8e' 
  AND token = '4EKkUWdizg9ftRC4w1AVNaw12H8GgiRFyYbIPE/4nb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}